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Strange "Chirping" Noises in Needledrops
post Jul 29 2012, 00:34
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I was wondering if someone could help me identify these sounds in the quiet passages of these files. It sounds to me like a chirping, or perhaps a squeaking, and is present and noticeable in nearly every quiet passage.

The first sample is from the start of a song that is operatic and quiet. The second sample is the ending of the same song. I've included it, as it is much closer to the peak of the track, to give a sense of how audible these sounds are.

My skill in iZotope RX2 is limited and I can't seem to figure out how to remove the sounds altogether.
Attached File(s)
Attached File  01___Unknown_Title.flac ( 1.89MB ) Number of downloads: 157
Attached File  02___Unknown_Title.flac ( 1.91MB ) Number of downloads: 126

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post Jul 29 2012, 06:22
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There's a 'ghost' waveform throughout the file, concentrated in the upper frequencies, and there's broadband noise above ~18 KHz.
The broadband noise indicates dithering w/noise shaping; that's good.
It's the ghost waveform that's the problem. It's visible in both Spectro and Audition:

(This is the last 1 second or so of the 2nd file).

So I suspect the original was downsampled with a very bad resampler. What was in the original that's manifesting as a "ghost" here, I don't know. I'm not an expert in this kind of thing.
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